1、FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 1 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100APPENDIX ASteel ISO Metric Threaded Fasteners Torque/Clamping Force PerformanceRecommended Testing Technique Using Manual Torque Wrenches to Determine Torqu
2、e PerformanceCharacteristics of Steel Hexagon FastenersA1. SCOPE.This appendix describes a recommended method for measuring the torque and performancecharacteristics of fasteners, employing a manual torque wrench or other slow speed drivetechnique. It is intended primarily for product quality assess
3、ment. For referee purposes anautomatic electronic sensing device shall be used (See Clause 6).A2. APPARATUS.A.2.1 Hand torque wrenches of a size suitable for the range of test torque values anticipated. Accuracy and range shall be as specified in Clause 6.1A.2.2 Clamping force test fixture to hold t
4、he test fastener and test washer, and to measure theclamping force produced by tightening the fastener to be tested. (A strain gauge load cellis preferred, but a hydraulic cell is acceptable.) A suitable fixture is shown in Figure A1. Accuracy shall be as specified in Clause 6.2.A3. TEST PROCEDURE.T
5、he test method to determine torque/clamping force performance is specified in Clause 6.FORD WORLDWIDE FASTENER STANDARDDate: 1993-01-01Engineering Standards & 2 of 2 Printed copies are uncontrolled .Systems Engineering (ESSE)WZ 100APPENDIX ASteel ISO Metric Threaded Fasteners Torque/Clamping Force PerformanceFigure A1. Plan of a test fixture - Clamp load measuring device
